摘要
分别用RANS-SA方法和DES方法对NACA0012翼端梢涡进行模拟计算,分析了梢涡区域网格局部加密对梢涡计算结果的影响,并与实验结果进行了对比.相比于RANS-SA方法,DES方法在梢涡流场计算中具有更好的适用性,能够得到更准确的流动信息和更精细的涡结构;另外,网格局部加密对脉动量的计算影响很大.通过对脉动量的分析发现,在近尾缘处,几股涡的融合产生了比较强烈的脉动,随着梢涡的逐渐稳定,脉动量也逐渐减小;现有的实验结果显示在偏下游处会产生梢涡的振荡现象,使统计脉动量增大,而本文计算中未发现该现象.
The simulation of NACA0012 wing-tip vortex has been conducted respectively by the methods of RANS-SA and DES. The influence of local grid refinement on the computed result has been analyzed. Numerical results were compared with experimental data. The comparison shows that the method of DES is more applicable than RANS-SA in the simulation of tip vortex The method of DES can capture more accurate fluctuations and smaller vortex structures. Besides, the local refinement of grid has very significant influence on the calculation of fluctuations. The result of simulation shows that a strong fluctuation is generated when several small vortices merge near the trailing edge. And the fluctuation decreases with the tip-vortex stabling. It was reported that the meandering of tip vortex appears at downstream in the experiment research, which can make fluctuation increase. However, the meandering is not found in this simulation.
出处
《力学季刊》
CSCD
北大核心
2014年第3期390-399,共10页
Chinese Quarterly of Mechanics
